Abstract:
According to some embodiments there is provided a sound and detection system comprising at least a digital sound reconstruction speaker apparatus, comprising a plurality of pressure-pulse producing elements, and at least a controlling unit configured to control the actuation of the plurality of pressure-pulse producing elements, so as to produce at least an ultrasonic beam directed towards space during at least a first time interval, for the calculation of at least the position of at least part of an object present in space based on the sensing of at least ultrasonic sound waves reflected by said part of the object, and control the actuation of the plurality of pressure-pulse producing elements, so as to produce audible content during at least a second time interval. Various other systems, methods and applications are described.
Abstract:
Procédé de reconstruction d'un profil d'une pièce (10), en utilisant un dispositif émetteur/récepteur (12) comprenant N éléments, ledit dispositif étant adapté à émettre une onde se propageant dans un milieu, comportant au moins les étapes suivantes: A) recueillir les signaux Si,j réfléchis par la pièce soumise à l'onde, B) mesurer le temps de vol de l'écho de surface tj pour plusieurs couples émetteur-récepteur {E I ,R j }, C) construire la famille des ellipses Γ c associées à ces couples émetteurs {E I ,R j }, D) calculer l'enveloppe de la famille des ellipses Γ c , E) à partir de cette enveloppe déterminer les points Pi constituant le profil de la pièce.
Abstract:
Disclosed are methods and systems for tracking a toolstring at subsea depths. One system includes a remote operated vehicle (ROV), a wireless transmitter arranged on the toolstring and configured to transmit one or more wireless signals, a wireless receiver configured to perceive the one or more wireless signals, whereby the ROV is able to locate a position of the toolstring in the oceanic environment.
Abstract:
System and method for rapidly determining the geographic areas where spatial overlap of arbitrarily oriented (i.e. not just parallel) swath sensor data meets a pre-selected specified percentage of swath width. The unique elements of the present teachings are: (1) a system and method for defining overlap polygons using individual ping edges; (2) a system and method for computing percent overlap using the edge points and the knowledge of which source polygon contributed the edge point; and (3) the use of a non-degenerate point to line distance computation. The system and method can be used to reduce the analysis time of swath sensor data.
Abstract:
This invention relates to a method and apparatus for inspecting pipeline girth welds from the inside of a pipeline by means of a robotic cart, remotely controlled externally by either an umbilical cord or a bi-directional wireless link. The robotic cart can be self propelled and can be driven from weld to weld by an operator, assisted by CCTV cameras. An array of ultrasonic probes are deployed from a rotating, robotic arm that extends from the cart front to the pipe wall, allowing the ultrasonic array to be placed at the weld and then rotated around the weld to provide 100% inspection of the weld. The acquired ultrasonic inspection data can be stored on an on-board computer for later analysis, and/or transmitted to an external computer for immediate analysis.
Abstract:
A phased array ultrasonic probe may be mounted to a component to be inspected for wall thickness on an apparatus that includes a split ring adapted to be magnetically held in place on the component. In particular, the probe may be mounted to a carriage connected to the split ring in a manner that allows the carriage to rotate around the split ring while the probe is in operation. Between the probe and the component, a transducer shoe defining, by a flexible membrane, a cavity and an aperture. Conveniently, the construction of the flexible membrane allows wall thickness measurements to be acquired in portions of the component that have complex topography, such as welds. The apparatus is installed on an adaptor assembly for inspection of straight section of pipes. This adaptor assembly is not used in absence of straight section. By acquiring data from multiple output pulse transmitted at multiple incidence angles, processing software may conveniently produce an accurate wall thickness map of the area of interest on the component.
Abstract:
A fiber optic acoustic sensor system. The fiber optic acoustic sensor system includes an optical source, and a fiber optic acoustic sensor array configured to receive an optical signal from the optical source. The fiber optic acoustic sensor array includes a core, a first polymer layer disposed on the core, an optical fiber wound around the first polymer layer, and a second polymer layer disposed on the first polymer layer such that the optical fiber is between the first polymer layer and the second polymer layer.
Abstract:
Le procédé comprend : a) l'émission d'une salve d'ultrasons répétée à une fréquence de récurrence prédéterminée; et b) après chaque émission et pendant la durée d'une trame temporelle (n-1, n, n+1,...) séparant deux émissions consécutives, la réception d'une pluralité de pics de signal successifs apparaissant au cours de la même trame. Ces pics incluent des pics parasites (E' n-1, (E' n, E n+1, ... ) en provenance de l'émetteur d'un autre drone, et un pic utile (E' n-1, (E' n, E n+1, ... ) correspondant à la distance à estimer. Pour discriminer ces pics, on exécute les étapes suivantes : c) pour deux trames consécutives, comparaison des instants d'arrivée des p pics de la trame courante avec les instants d'arrivée des q pics de la trame précédente et détermination, pour chacun des p.q couples de pics, d'un écart temporel relatif correspondant; d) application aux p.q écarts déter minés à l'étape c) d'un critère de sélection permettant de ne retenir qu'un seul pic de la trame courante; et e) estimation de la distance en fonction de l'instant d'arrivée du pic ainsi retenu.
Abstract:
The present invention provides an improved vehicle-mounted sonar device for determining one or more plant yield characteristics, wherein the device comprises an ultrasonic transmitter for transmitting timed pulses of ultrasonic energy towards plant material at an angle up to about 20 degrees relative to the longitudinal shoot axis of plants, an ultrasonic receive for receiving echoes from the plant material, means for filtering the received echoes, a temperature sensor and computational means for correcting for the effect of variations in ambient temperature as determined by the temperature sensor, and optional means for reducing interference by moving parts of the vehicle to which it is mounted. The present invention also provides methods of using the improved vehicle sonar device and for calculating one or more plant yield characteristics.